Few containers had trickled across the border since Islamabad reopened the routes three weeks ago, but officials at Torkham, in Pakistan's northwestern tribal district of Khyber, said more than 100 had crossed in the last two days.
Islamabad closed its land routes to Nato convoys in November following botched US air strikes that killed 24 Pakistani soldiers, but reopened them on July 3 after Washington said sorry for the deaths.
"More than a 100 trucks have crossed Torkham border in the past two days, a total of 140 have so far crossed into Afghanistan," Obaidullah Khan, a customs official at Torkham, told AFP.
Before the blockade, around 150 trucks crossed into Afghanistan each day at Torkham – the closest border crossing to Kabul – and officials say the flow will rise to up to 300 a day.
News of the increase came a day after gunmen attacked Nato supply trucks near a market in Jamrud town in Khyber, killing a driver.
There was no immediate claim of responsibility for Tuesday's attack but Pakistani Taliban have threatened to attack Nato trucks and kill their drivers.
Right-wing and religious groups have staged regular demonstrations against the resumption of convoys since the government announced the end of the blockade.
Mohammad Miraj, a senior administrative official at Torkham, confirmed the increase and added that security has been tightened because of the recent attack and the increased flow of trucks.
The air strikes and blockade crisis was the worst episode in Pakistan's decade-long partnership with Washington in the war in Afghanistan, with both sides still struggling to overcome a breakdown in trust.
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Vienna,July 25,2012 Hopefully the new beginning would pay for all concerned including the attackers.The seven months silence had impacted business. I also hope Af-Pak relations improve with reciprocal actions against the insurgents.Both countries need peace and prosperity. Taravadu Taranga Trust for Media Monitoring TTTMM India --Kulamarva Balakrishna